Aud gabbett



vB. MOORE AND 6. o. STANSBURY.

PUMPING JACK.

APPUcATxoN FILED APR. 14, 19|9.

l ,3 l 365 .f Plnted July 15, 1919.

THE coLLMmA PLANoGRAPp co.. WASHINGTON. D. c.

UNITED STATES PATENT FFIC.

BENTON MOORE, OF CHERRYVALE, KANSAS, AND GARRETT O. STANSBURY, 0F KANSASCITY, MISSOURI.

rUMPING-JACK.

Specification of Letters Patent.

Patented July 15, 1919.

Application led Aprl14, 1919. Serial No. 289,998.

To all whom t may concern.'

Be it known that we, BENTON MOORE and GARRn'rr O. S'rANsBURY, citizens'of the United States, and residents, respectively, of Cherryvale, inthe county of Montgomery and State of Kansas, and of Kansas City, in thecounty of Jackson and State of Missouri, have invented certain new anduseful Improvements in Pumping-Jacks, of which the following is aspecification.

This invention relates to oil Well pumping jacks and has for its objectto produce a simple and eliicient pumping mechanism which shall exertits greatest leverage at the beginning of the power stroke and graduallydiminish such leverage to the end of such stroke, and in whichpractically all tendency of the lever beam to bend the piston stem orpolish rod as it is generally termed, shall be avoided. A further objectis to produce a pump-jack of the character outlined, which can be madeand installed at low cost.

l/Vith these objects in view 4the invention consists in certain noveland useful features of construction and combinations of parts ashereinafter described and claimed; and in order that it may be fullyunderstood reference is to be had to the accompanying drawing, in which:

' Figure 1, is a `side elevation of a pumping jack embodying theinvention, certain parts being broken away to disclose featuresotherwiseJ more or less hidden.

Fig. 2, is a top plan view of the pumping 'ack.

J In the said drawing, 1 indicates a suitable bed frame ibuilt aroundthe polish rod 2 of an oil Well pump, the head of the casing thereofappearing at P, and 3 is a collar secured upon said rod by a set screw4, and provided with oppositely projectlng trunnions 5 pivotally engagedby a pair of plates or extensions 6 proJectmg from the front end of alever or beam 7, the same having a longitudinal slot 8 at its rear endwhereby it is slidingly fulcrumed on an antifriction roller 9, mountedon a rod 10 connecting a air of standards 111 fastened to the bed rame1.

At an intermediate point of the bed frame is a pair Iof standards 12,and connecting said standards is a pivot 13 for a triangular lever 14underlying the lever beam 7, and provided with a grooved roller l5engaging and receiving the lower edge of the lever beam, it being notedby reference to Fig. 1 that when the lever beam isin its loweredposition the roller of the triangular lever is in engagement with thebeam at the front end thereof and hence is in position at the beginningof the ensuing up stroke, to apply the greatest leverage upon the beam.

To operate the triangular lever, its rear or depending arm has a crosspin 16 engaging one or another of a series of holes 17 in said arm, andpivotally connected to said pin is a connecting rod or clevis 18, forenn gagement with a shackle rod or the like, not shown, whereby thetriangular lever and hence the lever beam and polish rod are operated,and in this up and down swinging movement of the lever beam, whichslides back and forth at its slotted end upon the roller 9, its'frontend where engaged with the trunnions 5 travels vertically upward anddownward without imposing any appreciable lateral or bending strain onthe polish rod, it being also understood that the reciprocation of theshackle rod referred to, determines the strokes of the levers and thelength of movement of the polish rod.

'lhe triangular lever as shown, is of skeleton form to give it therequired stiffness against lateral movement, that is to say the sides ofsaid triangular lever are composed of similar bars spaced apart, withthe hypotenuse side connecting the front and lower ends respectively ofthe upper and the depending arms of said lever.-

Pumping jacks constructed as shown and described have proven verysuccessful in use and are very desirable because of their simplicity andcomparative cheapness, and while the preferred construction is shown anddescribed, it is obvious that it may be modified in minor particularswithout departing from the principle of construction involved.

We claim:

1. A pumping jack comprising a fulcrum, a lever beam slidably fulcrumedthereon and pivotally connected at its front end to the polish rod of anoil well pump, a lever fulcrumed below and at a point intermediate thelength of said lever beam and having a rolling engagement with theunderside of the latter, and means for rocking said lever to cause it onits upward movement to raise the lever beam and gradually shorten itsleverage thereon during suoli movement.

2. A pumping` jack comprising a suitable Support, a fulorum thereon, aroller jou-rnaled on said fulcrum, a lever beam having a longitudinalslot in its rear end engaging said roller, and having forwardly projeoting arms at the front end pivoted to the polish rod of an oil wellpump, a fulorum below said beam and at a point intermediate the lengththereof, triangular lever pivoted on said Alast-,name d fulorum andembodying a depending `arm and a forwardly proj eating arm and a rollercarried at the front end of the latter and engaging the underside ofsaid lever beam, and means connected to the depending arml for impartingrocking movement tg said triangular lever.

3. pumping jaol -comprising a bed frame, a guide for the polish rod ofan oil well pumpj a pair of standards mounted on said frame and carryingbetween them a roller, a lever beam having a longitudinal slot engagingsaid roller, and a pair of eX- tensions projecting from its front endand pivotally Connected with the said polish rod, a pair of standardsupon the bed frame at an intermediate point of the length thereof, atriangular lever fulorumed on and between said last-named standards andunderlying said lever beam, a roller carried at the front end of saidtriangular lever and engaging the underside of said lever beam, and alink pivotally connected to said triangular lever and imparting rockingmovement thereto for raising and lowering said lever beam.

In testimony whereof, we afliX our signatures.

BENTON Mooim, GARRETT o. sraNsBURY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C,

